I can't exit bios / CSM keeps going back to disabled

I'm new on pc so I dont know much, I just clicked the update and shutdown option on my pc last night thinking its just another small windows update but when I open my pc today it directs me on BIOS and i can't exit. Also I seen that it displays "no bootable device found" and I can't enable CSM because i disabled it before because it relates on something in playing valorant (i cant remember). So what do I do at this point?